Study: lack of cloud physics biased climate models high

The Hockey Schtick brings this to our attention. It seems Dr. Roy Spencer was prescient with his observation:

“The most obvious way for warming to be caused naturally is for small, natural fluctuations in the circulation patterns of the atmosphere and ocean to result in a 1% or 2% decrease in global cloud cover. Clouds are the Earth’s sunshade, and if cloud cover changes for any reason, you have global warming — or global cooling.”